Magnetic plug



M. M. COHN MAGNETIC FLU G July 2-4, 1956 Filed April 15, 1954 INVENTOR.

United States PatencOfiFice 2,755,932

Patented July 24, 1956 magnetic plug ofthis invention mounted in the'opening; Fig. '2 is a perspective view of a portion of the magnetic plug illustrated in Fig. l;

55 3 Fig. 3 is a side 'elevational view of a portion of the plug illustrated in Fig. 1 but showing the bar magnets col- MAGNETIC'PLUG lapsed together;

, .7 an. .t Fig. 4 is a sectional view similar to'Fig. 1 but illus- Mllton Calm Chicago m. l trating a liquid reservoir with the opening/in the corner APPIi'C'HIiQB P 1954; 422,772 thereof and with a slightly'modified form of the magnetic plug secured in'the opening;

Fig.- 5 is an exploded view of a portion of the magnetic plug illustrated in Fig.4;

Fig. 6'is a top plan view of a portion of a magnetic plug having three bar magnets; This inv ntion 'is directediofl"magnetic P for an Fig. 7 is a side 'elevational view of'the portion of the opening in a liquid reservoir for'clo'singthe opening and ping iiiustiaied in pi 5; for separating para-magnetic particles from the liquid in Fig 3 iS a Pian i p i 0f' anOther,p1'ug haythe reservoir. Such magnetic plugs provided with rn'aging f ba magnets; nets have particular utility in connection with 'gearcas'es, Fi 9 is a id eievaiionai i of h ion f ihe crank cases, transmission cases, differential cases, coolmagnetic piu'g lu d i Fi 3; ing'system, liquid cooled transformers and the'like where pp 1 there i iiiusiraied a all-10 f a liquid ahfiisive pai'a-ihhgheiic pafiihiess Such' as Steel Chips and ervoir such as a gear case, a crankcase, a transmission particles and the like,'causing undue'wearto moving parts, case, a diff ti l ase, a cooling system or a liquid should be removed e amount of Para-magnetic coeled transformer or the like. The wall 10 may be proterial separated from the liquid depends inlarge amount i i a boss 11 h i d-o tapped upon the strength, size andsurface area of "the magnets h l 12 which holernay act as a drain openingtf j h u r vthis P P Quite oiieh'ihh p in ihe reservoir. Thereservoir contains a liquid 13 which may ervoi'r's adjacent the openings thereof foraccorhmodating ontain ara-magnetic particles which are to be removed the magh'sis is limited y T635011 The C105? Proximity from the liquid. Here, the drain openingis' shown to be of the moving Paris arranged in ihevfesefvoihs- Hence, in the bottom of the reservoir. The clearance abovethe in hiiolmagheiic PhlgSihe magnets hhvehee'h made quite drain opening 12 may be small since the reservoirrnay srn'all'so that their particle separatin'g'eifi'ciency has also nt i in rt i closeproximity h Opening. been quite small. The magnetic plug 'ofthis invention includes a plug Th6 piihciliiii Ohle'Ci of this invention is Provide an member 14 which is preferably screw'threaded as indicatimPTOVed magnetic Piilg {0i p hg ihia iiililid ed at 15 so that the same may be secured-in the drain er voir'ior closing the opening and for separating para- Gpening 12 by screwing h t 10 Claims. Cl; 210"-1.'5

in powerful and large bar magnets having large-magnetic 15 by h' areas may be lllii-iZed for obtaining maximum particle Stlpthe opening The inner 5nd of the plug membe 14 i arat-ing efficiency, wherein it maybe used in con unct n vided with a stem 17 which; as here illustrated; issepwith reservoir spaces having-limited clearance, which is bl f theplug embe 14,- I thi o ti th simliic install and Which y he ihexphh'siviy mhhustem 17 is provided with screw threads 18 to be screwed factured. into a tap ed hole in the plug member 14 If (lESlIE' Briefly, the magnetic 'plug of this invention includesa the stem 17 may be made integral wlth the plug member plug'melnber which is adapted to be re'movably received 14; The end 19 of the stem 17 -is rovided with a pair the opening in the reservoir for closingthesame and of parallel recessed faces and is also provided with a hole which is provided with a stem protruding froih' it's inner 21 extending through the rece'ssedfa'ce's. The e d end; anda plurality ofbar magnets for separating the faces terminate in shoulders 20*which are substantially straight across.

v The magnetic plug also includes a pair of bar magnets that-the bar magnets may be collapsed together for in- 22 which may be cast sintere'd magnets. One end of serti'on through the opening and may be spread apart in these bar magnets 22 are provided with holes 23. T h rfiSeFVOifpfeffiiahiy, the iiiilB poles of the bar gbar magnets 22 are so arranged that'their like poles are nets are arranged adjacent each vother so as to g a adjacent each other so that the holes 23 are located in like ly repel each other. As aresult the bar magnets are poles of the magnets. Thus,-the magnets 22 operate to Spread apart iheihservo'ii y the "magnetic relieiiihg magnetically repel each other. The magnets 22 are force and shliaiaie Springs for thiS P p 3Y6 placed against the fiat'faces of the stem 17 and a flat q y reason of this'spreading apart of the'bar headed rivet 24 is inserted through the holes 23 in the magnets in the reservoir maximum magnetic area may b magnets d the hole 21 in' th t m, A a sult,

he provided'in a space having'minimu'm clearance, Stops one end of the bar magnets 22 are ivotally-mounted n are also preferably provided for the 'bar' magnets to limit the end of the stem 17. the spreading thereof so-that they will not normally connetically repel each othe tact the Walls of the reservoir.-

Further objects of this inventionreside inthe details of construction of the magnetic plug and in the cooperative' relationships betweenthe component parts thereof Other objects and advantages will become apparent'to When the ma those skilled in the art upon reference to the accompany- 12 of the reservoir t ing specification, claims and drawing'in which: together so that the Fig. l is a partial sectional view through a part of a ing." Aft'er'the bar magnets liquid reservoir-and its opening'showin'g'oneform of the the opening, they automaticall nets to this position being limited by the shoulders 21). The magnets 22 may be collapsed together against the 22 have assed" through y. spread apart to the position illustrated in Figs. 1 and 2 so that they do not interfere with the moving parts in the reservoir. The bar magnets 22 are relatively powerful magnets and present a large magnetic surface to provide maximum efficiency in separating the para-magnetic particles from the liquid 13 in the reservoir. At the same time, they do not protrude far into the reservoir in the Way of the moving parts therein and, accordingly, maximum separating efiiciency is provided for minimum clearance. Fig. 4 shows a reservoir arrangement wherein the opening 12 is located in the corner of the reservoir. For this type of installation angular shoulders 2tlA, as illustrated in Fig. 5, are utilized for limiting the extent of spreading of the bar magnets 22. Thus, in both arrangements illustrated in Figs. 1 and 4, the shoulders 20 and 20-A, respectively, form'stops for limiting the spreading of the bar magnets 22 so that they Will not touch the walls of the reservoirs. This, coupled with the fact that the stem 17 and the rivet 24 are preferably made from aluminum, provides for maximum efiiciency in separating the para-magnetic particles from the liquid.

Figs. 6 to 9 illustrate arrangements wherein more than two bar magnets may be utilized. In Figs. 6 and 7 the stem 30 which may be secured to the plug member 14 is provided with a flange 31 and a triangular projection 32. This triangular projection 32 is provided with three slots 33 and is also provided around its edge with a groove 34. The bar magnets 35 may be like those illustrated in Figs. 1 to 5 or they may be separate magnets secured into caps 36 having extensions provided with holes extending into the slots 33. A Wire clip 37 extends through the holes in the caps 36 and is located in the groove 34 for pivotally mounting the bar magnets 35 on the projection 32. Here also like poles of the bar magnets are arranged adjacent each other so that the magnets operate to repel each other. The magnets 35 may be collapsed together for insertion through the opening in the reservoir and after they are so inserted they automatically spread apart in the reservoir by means of the magnetic repelling force. The magnetic plug arrangement of Figs. 6 and 7 operates in the same manner as discussed above in connection with Figs. 1 to 5 and a further description is not considered necessary. In the arrangement of Figs. 6 and 7 the flange 31 operates as a stop for limiting the spreading of the bar magnets 35.

The arrangement illustrated in Figs. 8 and 9 is like that illustrated in Figs. 6 and 7 except that four bar magnets 35 are utilized instead of three. Here the flange 31 on the stem 30 is provided with a square projection 40 which is provided with slots 41 and a groove about the projection indicated at 42. The ends of the caps 36 are received in the slots 41 and a spring clip 43 extends through the holes in the caps 36 and is located in the groove 42 for pivotally mounting the bar magnets 35 on the projection like poles of the bar magnets 35 are arranged adjacent each other so that the bar magnets 35 operate to magnetically repel each other. The manner of operation of the arrangement of Figs. 8 and 9 is like that described above in connection with Figs. 1 to 7 and a further description is not considered necessary.

While for purposes of illustration, several forms of this invention have been disclosed, other forms thereof may become apparent to those skilled in the art upon reference to this disclosure and, therefore, this invention is to be limited only by the scope of the appended claims.

I claim as my invention:

1. A magnetic plug for an opening in a liquid reservoir for closing the opening and separating para-magnetic particles from the liquid in the reservoir, comprising a plug member adapted to be removably received in the opening for closing the same and having a stem 40 of the stem 30. Here, also,

protruding from its inner end, a plurality of bar magnets for separating the para-magnetic particles from the liquid, and means for pivoting the bar magnets at one of their ends to the stern so that the bar magnets may be collapsed together for insertion through the opening and may be spread apart in the reservoir.

2. A magnetic plug for an opening in a liquid reservoir for closing the opening and separating para-magnetic particles from the liquid in the reservoir, comprising a plug member adapted to be removably received in the opening for closing the same and having a stem protruding from its inner end, a plurality of bar magnets for separating the para-magnetic particles from the liquid, said bar magnets being arranged With their like poles adjacent each other so as to magnetically repel each other, and means for pivoting the bar magnets at one of their ends to the stem so that the bar magnets may be collapsed together against the magnetic repelling force for insertion through the opening and may be spread apart in the reservoir by the magnetic repelling force.

3. A magnetic plug for an opening in a liquid reservoir for closing the opening and separating para-magnetic particles from the liquid in the reservoir, comprising a plug member adapted to be removably received in the opening for closing the same and having a stern protruding from its inner end, a plurality of bar magnets for separating the para-magnetic particles from the liquid, and means for pivoting the bar magnets at one of their ends to the stem so that the bar magnets may be collapsed together for insertion through the opening and may be spread apart in the reservoir, and stops on the stem engageable by the bar magnets for limiting the spreading thereof.

4. A magnetic plug for an opening in a liquid reservoir for closing the opening and separating para-magnetic particles from the liquid in the reservoir, comprising a plug member adapted to be removably received in the opening for closing the same and having a stem protruding from its inner end, a plurality of bar magnets for separating the para-magnetic particles from the liquid, said bar magnets being arranged with their like poles adjacent each other so as to magnetically repel each other, and means for pivoting the bar magnets at one of their ends to the stem so that the bar magnets may be collapsed together against the magnetic repelling force for insertion through the opening and may be spread apart in the reservoir by the magnetic repelling force, and stops on the stem engageable by the bar magnets for limiting the spreading thereof.

5. A magnetic plug for an opening in a liquid reservoir for closing the opening and separating para-magnetic particles from the liquid in the reservoir, comprising a plug member adapted to be removably received in the opening for closing the same and having a stem protruding from its inner end, said stem at its inner end being provided with a pair of parallel recessed faces and having a hole through the recessed faces, a pair of bar mag nets for separating the para-magnetic particles from the liquid and arranged in parallel planes with one of their ends engaging the parallel recessed faces of the stem, said ends of the bar magnets having holes therethrough, a pin extending through the holes in the stem and the bar magnets for pivoting the bar magnets at one of their ends to the stem so that the bar magnets may be collapsed together for insertion through the opening and may be spread apart in the reservoir.

6. A magnetic plug for an opening in a liquid reservoir for closing the opening and separating para-magnetic particles from the liquid in the reservoir, comprising a plug member adapted to be removably received in the opening for closing the same and having a stem protruding from its inner end, said stem at its inner end being provided with a pair of parallel recessed faces and having a hole through the recessed faces, a pair of bar magnets for separating the para-magnetic particles from the liquid and arranged in parallel planes with their like poles adjacent each other so as to magnetically repel each other and with one of their ends engaging the parallel recessed faces of the stem, said ends of the bar magnets having holes therethrough, a pin extending through the holes in the stem and the bar magnets for pivoting the bar magnets at one of their ends to the stem so that the bar magnets may be collapsed netic repelling force for insertion through the opening and may be spread apart in the reservoir by the magnetic repelling force.

7. A magnetic plug for an opening in a liquid reservoir for closing the opening and separating para-magnetic particles from the liquid in the reservoir, comprising a plug member adapted to be removably received in the and having a stem protrudstem at its inner end being provided with a pair of parallel recessed faces terminating in shoulders and having a hole through the recessed faces, a pair of bar magnets for separating the para-magnetic particles from the liquid and arranged in parallel planes with one of their ends engaging the parallel recessed faces of the stem, said ends of the bar magnets having holes therethrough, a pin extending through the holes in the stem and the bar magnets for pivoting the bar magnets at one of their ends to the stem so that the bar magnets may be collapsed together for insertion through the opening and may be spread apart in the reservoir, said shoulders being engaged by the bar magnets when the same are spread apart for limiting the spreading thereof.

8. A magnetic plug for an opening in a liquid reservoir for closing the opening and separating para-magnetic the reservoir, comprising a removably received in the opening for closing the same and having a stem protruding from its inner end, said stem at its inner end being provided with a pair of parallel recessed faces terminating in shoulders and having a hole through the recessed faces, a pair of bar magnets for separating the para-magnetic particles from the liquid and arranged in parallel planes with their like poles adjacent each other so as to magnetically repel each other and with one of their ends engaging the parallel recessed faces of the for insertion through the opening and may be spread about in the reservoir by the magnetic repelling force, said shoulders being engaged by the bar magnets when the same are spread apart for limiting the spreading thereof.

9. A magnetic plug for an opening in a liquid reservoir for closing the opening and separating para-magnetic particles from the liquid in the reservoir, comprising a plug member adapted to be removably received in the opening for closing the same and having a stern protruding from its inner end, the inner end of said stem having a plurality of slots therein and a groove around the stem adjacent the slots, a plurality of bar magnets for separating the para-magnetic particles from the liquid and having one of their ends received in the slots and pro vided with holes in said ends, and a wire extending through the holes in the bar magnets and received in the for insertion through the opening and may be spread apart in the reservoir.

10. A magnetic plug for an opening in a liquid reservoir for closing the opening and separating para-magnetic particles from the liquid in the reservoir, comprising a plug member adapted to be removably received in the opening for closing the same and having a stem protruding from its inner end, the inner end of said stem having a plurality of slots therein and a groove around the stem adjacent the slots, a plurality of bar magnets for separating the para-magnetic particles from the liquid and having one of their ends received in the slots and provided together against the magnetic repelling force for insertion through the opening and may be spread apart in the reservoir by the magnetic repelling force.

References Cited in the file of this patent UNITED STATES PATENTS 

